How much the audience already knows about an event
Answer:
In fact, minting coins is a valuable source of income for the federal government. ... The Mint strikes coins and sells them to the U.S. Federal Reserve — the country's central bank — for the face value of the coins. This creates the seigniorage. The Federal Reserve sells the coins to commercial banks at face value.
Fish farms,,,,,,,,,,,,,,,,,,,,
Answer: Cell phones are efficient and helpful technology.
Explanation: We can communicate and connect with others, we can use them in times of emergencies, and can even make the user feel more safe.
(Would write more, but super short answer because you said to do it quick) :)